Acta Astronautica
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#1K Sathiyamoorthy (NAL: National Aerospace Laboratories)H-Index: 2
#2Tahzeeb Hassan Danish (NAL: National Aerospace Laboratories)H-Index: 2
Last. S. R. Chakravarthy (Indian Institute of Technology Madras)
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Abstract In this study, the supersonic flow over strut cavities was experimentally studied to understand flow features. Instantaneous schlieren imaging in non-reacting flow experiments exhibited the seven types of waves associated with cavity pressure oscillations and the formation of unstable shear layers on both sides. The shear layers moved in and out in synchronous and asynchronous modes at the trailing edge of the strut cavities. The symmetrical wave structure appeared on both sides in the ...
#1Yuan Chai (NPU: Northwestern Polytechnical University)
#2Jianjun Luo (NPU: Northwestern Polytechnical University)H-Index: 7
Last. Jianfeng Xie (NPU: Northwestern Polytechnical University)
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Abstract Spacecraft is mostly abandoned after its fuel exhausts or actuator fails. Using microsatellites to implement attitude takeover control for failed spacecraft is a cost efficient way to recycle on-board valuable payloads at a low cost. In order to achieve collaboration between independent microsatellites, a differential game based method is proposed to stabilize the combined spacecraft composed of multiple microsatellites and the failed spacecraft, in which each microsatellite can indepen...
#1A. Stolfi (Sapienza University of Rome)H-Index: 2
#2Paolo Gasbarri (Sapienza University of Rome)H-Index: 17
Last. Arun K. Misra (McGill University)H-Index: 32
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Abstract Space Manipulator Systems (SMSs) are complex systems made of a platform equipped with one or more deployable robotic arms and they will be playing a major role in future autonomous on-orbit missions. The latter may as well involve manipulation operations of the target object which needs to be moved from an initial configuration to a final one suitable for the specific task under consideration. In the present study, the mission being analyzed concerns the manipulation of a passive body b...
#1Wenqing ZhangH-Index: 1
Last. Tianyi SuH-Index: 2
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#1Michael G. Smith (UPenn: University of Pennsylvania)H-Index: 6
#2Michelle Kelley (UPenn: University of Pennsylvania)
Last. Mathias Basner (UPenn: University of Pennsylvania)H-Index: 30
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Abstract Human spaceflight and the characteristics of people who become astronauts have changed over time. Here we present an analysis of n = 1265 manned spaceflights by n = 562 astronauts from 1961 to 2020 to investigate historical trends over time and between space agencies in terms of astronaut demographics and spaceflight duration. Generalized linear models and generalized linear mixed models were implemented with adjustments for all available demographic data as covariates. Women continue t...
#2Konrad SzocikH-Index: 4
Last. Christopher J. Corbally (UA: University of Arizona)H-Index: 5
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Abstract The space medicine literature reports changes in neurological systems of astronauts after spaceflight, which has caused understandable concern. Rehabilitative medicine provides a preliminary context to address these changes and creative efforts in preflight training and post-flight remediation have resulted. Research can now begin to determine the neurological changes that are most and least debilitating, the most and least reversible, and which can be tolerated as an adaptation to spac...
#1Baolin Wu (HIT: Harbin Institute of Technology)H-Index: 23
#2Chuang Xu (HIT: Harbin Institute of Technology)
Last. Yingchun Zhang (HIT: Harbin Institute of Technology)
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Abstract This paper investigates the problem of decentralized attitude synchronization and tracking for a group of spacecraft, whose communication topology is undirected, subject to inter-spacecraft communication resources constraints, model uncertainties and external disturbances. In order to reduce inter-spacecraft communication burden, a quantization mechanism is developed. In the quantization mechanism, the quantized sequences, whose storage size are much smaller than that of spacecraft's at...
Top fields of study
Remote sensing
Control theory